Heinrichs Messtechnik GmbH
OPERATING MANUAL TMU / UMC3
Page 33 of 122
4.
UMC3 transmitter
Application domain of the UMC3 transmitter
The UMC3 transmitter (hereinafter referred to as UMC3) for use with TM, TME TMR, TMU, TM-SH and HPC
Coriolis mass-flow sensors, is a programmable transmitter designed to captured and processes
measurement data from its associated sensor for displaying on its built in display or for the transmission of
measurement results via various interfaces.
Via its BE2 control unit, the UMC3 can be customised for use to fit a variety of applications. Although basic
configuration settings such as transmitter calibration are factory performed, other parameters such as those
for measurement data processing, analysis, display and output are user definable.
Mode of Operation
The Coriolis mass flow meter works on the principle that in a rotating system a force (known as Coriolis
force) is exerted on a mass at a rotation point that is moving towards or away from this point. Utilising a
suitable sensor construction, this force can be exploited for the direct measurement of the mass flow. The
UMC3 measures and evaluates signals received from sensors positioned on the flow tubes (see Section
3.2.1, “Measuring principle” on page 12).
System configuration
Transmitter:
The UMC3 regulates the excitation of the sensor vibration system and processes the sensor signals. The
standard model is equipped with two analogue, passive 4 to 20 mA outputs, an impulse or frequency output
and a status output, and is enabled for digital data transfer via the HART
®
protocol.
Sensor:
Coriolis sensors measure mass-flow, density and temperature of fluids or gases. They can be used to
perform measurements with any liquid or gaseous product providing that the sensor material is suitable for
the product to be measured.
UMC3 performance characteristics
Reference conditions
In conformity with IEC 770.
Temperature: 20 °C (68 °F), relative humidity: 65 %, air pressure: 101.3 kPa (14.7 psi).
Measured error
For measurement errors and zero point stability refer to the sensor data sheet in section 3.3.2, “TMU flow
ranges” on page 13.
Repeatability error
0.05 % of the actual value (Sensor with transmitter).
For more details refer to the sensor data sheet or section 3.3.2, “TMU flow ranges” on page 13.
Influence of ambient temperature
Max.
0.05 % per 10 °C
